Sudoku Free HD by Acropa is a free Android game that offers a comprehensive and powerful Sudoku engine. The game is supported by non-intrusive advertising, which is displayed only at the start-up or when starting a new game. The game boasts 21 playing levels of auto-generated and unique puzzles. The game offers three games in one, namely numeric, alphabetical, and symbolic. The game allows billions of auto-generated unique puzzles created faster than the blink of an eye.

The game offers intelligent cells that keep track of your touches and lock correct answers, requiring two touches to enter values. You can customize the puzzle grid with millions of color possibilities, gradients, and shapes in your live puzzle. The game also supports font types like Hanzi, Hangul, Hiragana, Persian, Arabic, Hebrew, Thai, Devangari, Tamil, and Bangali. The game also features a Sudoku solver to enter puzzles from various sources or to create your puzzles with auto notes and commit to playing or solving immediately. The game also has an in-game help function, speech or melodic key click sounds with the ability to mute, and three note levels: manual notes, auto-single notes, or auto all notes.